<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="ToggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu text-color="#fff" 
          active-text-color="#409EFF" background-color="#333744" unique-opened :collapse="isCollapse"
          :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="menu.id + ''" v-for="menu in menuList" :key="menu.id">
            <!-- 一级菜单模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[menu.id]"></i>
              <!-- 文本 -->
              <span>{{ menu.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subMenu.path" v-for="subMenu in menu.children" :key="subMenu.id"
              @click="saveNavState('/' + subMenu.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subMenu.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    name: 'Home',
    data() {
        return {
            // 左侧菜单数据
            menuList: [],
            iconObj: {
                '125': 'iconfont icon-users',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: ''
        }
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
        // 获取所有的菜单
        async getMenuList() {
            const { data: res } = await this.$http.get('menus')
            // console.log(res);
            if(res.meta.status !== 200) this.$message.error(res.meta.msg)
            this.menuList = res.data
        },
        // 点击按钮，切换菜单的折叠与展开
        ToggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
  // .home-container {
  //   height: 100%;
  // }
  .home-container {
    height: 100%;
  }
  .el-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;
    padding-left: 0;
    background-color: #373d41;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: 0;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    color: #fff;
    line-height: 24px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>